Table 2.
Lignosulfonate composition based on EA, HS‐GC, 31P NMR spectroscopy, and acidic methanolysis.
|
Sample |
Elemental analysis |
HS‐GC |
31P NMR |
Methanolysis |
||||
|---|---|---|---|---|---|---|---|---|
|
method |
name |
C9 formulae |
C9 M w [g mol−1] |
SO3H [mmol g−1] |
OCH3 [mmol g−1] |
aliphatic OH [mmol g−1] |
phenolic OH [mmol g−1] |
sugars [mg g−1] |
|
HIC |
LS |
C9H11.2N0.06S0.32O4.3 |
198.6 |
1.63 |
4.14 |
2.43 |
1.88 |
11.32 |
|
1F |
C9H11.7N0.19S0.39O4.8 |
211.8 |
1.84 |
3.36 |
1.44 |
1.78 |
7.41 |
|
|
2F |
C9H12.4N0.19S0.38O4.9 |
213.5 |
1.77 |
n.d. |
n.d. |
n.d. |
n.d. |
|
|
3F |
C9H11.0N0.20S0.34O5.0 |
212.5 |
1.58 |
3.20 |
0.70 |
1.31 |
8.90 |
|
|
4F |
C9H10.8N0.16S0.31O4.2 |
199.0 |
1.58 |
4.03 |
1.05 |
1.41 |
9.60 |
|
|
5 F |
C9H10.7N0.11S0.33O5.2 |
213.3 |
1.53 |
3.14 |
n.d. |
n.d. |
n.d. |
|
|
6F |
C9H10.9N0.13S0.29O5.2 |
213.3 |
1.38 |
2.79 |
n.d. |
n.d. |
n.d. |
|
|
UF |
3–10 |
C9H11.0N0.05S0.36O4.2 |
199.0 |
1.83 |
4.30 |
2.93 |
1.94 |
8.34 |
|
10 |
C9H10.9N0.07S0.41O4.5 |
204.7 |
2.01 |
3.83 |
2.43 |
2.31 |
11.03 |
|
|
10–30 |
C9H10.7N0.04S0.35O4.2 |
197.3 |
1.79 |
4.13 |
2.84 |
1.81 |
14.45 |
|
|
30–100 |
C9H10.5N0.17S0.33O3.7 |
191.6 |
1.74 |
3.87 |
2.75 |
1.78 |
n.d. |
|
|
100 |
C9H10.8N0.04S0.32O4.0 |
193.7 |
1.66 |
4.13 |
2.49 |
1.72 |
12.43 |
|